T205 Size Variance

[Centauri]

I have been working on the T205 set for a few months now, and am learning quite a bit along the way.

I have focussed on buying graded cards, but recently picked one up online, and when it arrived, it looks strongly like it was trimmed, though carrying a clean PSA 4 grade. It is significantly smaller than the case, or others like it. Measured against other cards, it is about .3cm smaller horizontally.

I assume there was some variance in cards back then, but is this within reason?

Also, how common is it for one of the major grading services to miss something that appears quite obvious? Would you be more likely to just accept its legitimacy?